In the reaction of sodium halides with sulfuric acid, sodium hydrogen sulfate is produced \eqref{NaHSO4}. Why would this be produced instead of sodium sulfate \eqref{Na2SO4}? \begin{align} \ce{NaX + H2SO4 &-> NaHSO4 + HX}\tag1\label{NaHSO4}\\ \ce{2 NaX + H2SO4 &-> Na2SO4 + 2 HX}\tag2\label{Na2SO4} \end{align}

Is this because of lower energy requirement for this reaction compared to forming sodium sulfate?


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